A bio-tribocorrosion comparison between additively manufactured and forged Ti6Al4V parts

Sina Matin; Sahar Toorandaz; Saman Nikpour; Hamidreza Abdolvand; Ehsan Toyserkani; Yolanda S. Hedberg

Additive Manufacturing Letters (Dec 2023)

A bio-tribocorrosion comparison between additively manufactured and forged Ti6Al4V parts

Sina Matin,
Sahar Toorandaz,
Saman Nikpour,
Hamidreza Abdolvand,
Ehsan Toyserkani,
Yolanda S. Hedberg

Affiliations

Sina Matin: Department of Chemistry, Western University, London, ON N6A 5B7, Canada
Sahar Toorandaz: Multi-Scale Additive Manufacturing Lab, Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Saman Nikpour: Department of Chemistry, Western University, London, ON N6A 5B7, Canada
Hamidreza Abdolvand: Department of Mechanical and Materials Engineering, Western University, London, ON N6A 5B7, Canada
Ehsan Toyserkani: Multi-Scale Additive Manufacturing Lab, Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Yolanda S. Hedberg: Department of Chemistry, Western University, London, ON N6A 5B7, Canada; Surface Science Western, Western University, London, ON N6G 0J3, Canada; Corresponding author at: Department of Chemistry, Western University, London, ON N6A 5B7, Canada.

Journal volume & issue: Vol. 7
p. 100156

Abstract

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Ti6Al4V has been used widely as a biomedical alloy and is increasingly manufactured by additive manufacturing due to customized shapes. As implant material, it is frequently exposed to both friction and corrosive environments. This study investigates the effect of the fabrication process (laser powder bed fusion and forging) on the tribocorrosion behavior of Ti6Al4V in various environments including diluted hydrochloric acid to simulate the acidic environment in a crevice (HCl), phosphate-buffered saline (pH 7.3) with 10 g/L bovine serum albumin (PBS+BSA), and PBS+BSA with 30 mM H2O2. While the presence of BSA hindered the repassivation (reforming of the protective passive surface oxide), the presence of H2O2 accelerated it. HCl resulted in a localized tribocorrosion process. The highest plastic deformation rate was found in the PBS+BSA solution followed by HCl and PBS+BSA+H2O2. In addition, AM parts presented a higher microhardness and smaller grain sizes compared to forged materials. There was no influence of the manufacturing process on the coefficient of friction (COF) in HCl and PBS+BSA solutions, however, a significantly higher COF was found for forged samples in PBS+BSA+H2O2 than AM samples. Tribocorrosion was more extensive for forged than AM Ti6Al4V in all solutions.

Published in Additive Manufacturing Letters

ISSN: 2772-3690 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Technology (General): Industrial engineering. Management engineering
Website: https://www.journals.elsevier.com/additive-manufacturing-letters/

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